<!DOCTYPE html>
<html>
<head>
    <style>
        .container {
            position: fixed;
            top: 50%;
            right: 50px;
            transform: translateY(-50%);
        }
        
        .btn {
            padding: 10px 20px;
            background-color: #4CAF50;
            color: white;
            border: none;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <div class="container">
        <button class="btn">按钮</button>
    </div>
</body>
</html>
